KHNP official Kim Tae-seok was quoted by Yonhap News Agency as saying that the cracks were found in six out of 84 tunnels that guide the control rods at the Hanbit No. 4 reactor, which is situated in Yeonggwang, southwest of Seoul.

The cracks, however, do not pose any radiation risks, Tae-seok added.

The newly found cracks are however, likely to postpone the resumption of reactors’ operation by approximately ten days, from its originally scheduled date of 01 January 2014, BusinessKorea reports.

Another reactor of Kori NPP had temporarily shut down last week, due to problems with its generation system, raising an alarm of power shortages in the forthcoming winter season.